Boll Weevil Damage Research Articles

Evaluation of cotton cultivars based on the compensatory increase of cotton squares after simulating damage by the cotton boll weevil

ABSTRACT The objective of this study was to evaluate cotton cultivars based on the compensatory increase of cotton squares in response to the simulation of the boll weevil damage. The first experiment aimed to evaluate cotton cultivars with greater compensatory increase in squares removed artificially from the plant. The experimental design was in randomized blocks, in a 4 × 2 factorial scheme with 100% removal of cotton squares at 50, 70 and 90 days after the emergence of the FM975WS, TMG81WS, IMA6501B2RF and BRS432B2RF cotton cultivars and passive production (without removal) and active (with removal) of cotton squares, with four replications. In the second experiment, boll weevil damage in the TMG80WS and BRS432B2RF, with greater and lesser compensatory increase of cotton squares, after their removal at 50 days of age, was evaluated. The experimental design was in randomized blocks, in a 2 × 2 factorial scheme, with the former cultivars sprayed with carbamate or not (control). The compensatory increase of cotton squares, mainly after their artificial removal at 50 and 70 days of age, of the TMG81WS, was greater. The cotton square compensatory increase after being artificially removed in the cotton cultivars was higher during the period of exponential production of these reproductive structures and can be used to select cultivars tolerant to boll weevil damage.

Kaolin spraying protects cotton plants against damages by boll weevil Anthonomus grandis Boheman (Coleoptera: Curculionidae)

The high cost of insecticides, the emergence of insecticide resistance in populations of a number of insect species and other problems arising from their continuous use, such as biological imbalance, cotton fiber waste, and environmental pollution, have prompted the development of new technologies aiming the control of Anthonomus grandis Boheman in cotton crops. This study evaluated the level of protection conferred by kaolin clay foliar spraying to cotton plants against boll weevil damage. Treatment-tested spraying kaolin or endosulfan on cotton plants. The highest percentage of oviposition-punctured squares were observed in the control, and the lowest percentages in the treatments sprayed with endosulfan and kaolin in a systematic manner and where the boll weevil reached the economic threshold at all assessments. The greatest numbers of non-attacked bolls by weevils and cotton-seed yield were observed under the endosulfan treatments, followed by the treatments of kaolin spraying. The smallest number of bolls and lowest cotton-seed yield were observed for the control plots. These finding are of practical significance because they may reduce the cotton production cost and environmental impacts of chemical pesticides and make possible the production of organic cotton with the presence of boll weevils.

Field Evaluation of Bt Cotton Crop Impact on Nontarget Pests: Cotton Aphid and Boll Weevil

Bt cotton plants expressing Cry1Ac protein have high specificity for the control of lepidopteran larvae. However, studies conducted in several countries have shown these plants have a differential impact on nontarget herbivores. The aim of this study was to compare the colonization rates and population abundance of the cotton aphid, Aphis gossypii Glover (Hemiptera: Aphididae) and the boll weevil, Anthonomus grandis Boheman (Coleoptera: Curculionidae), in plots of Bt (Nuopal) and non-Bt cotton (Delta Opal) in an experimental field in Brasilia, DF, Brazil. No difference was observed in the preference and colonization by winged aphids to plants from the two treatments. There was no significant difference in abundance of wingless aphids or in the production of winged aphids between treatments. Apparently, the parameters that control factors such as fecundity, survival, and dispersal were similar on both Bt and non-Bt plants. Monitoring of plants for coccinellids, a specialist predator of aphids, and ants that act on the dispersal of aphids among plants showed no significant difference between Bt and non-Bt plants, supporting the inference above. Regarding the effect on boll weevil, there was also no significant difference between treatments in the total number of fruiting structures attacked in each plot, the percentage of fruiting structures attacked per plant or on the number of weevils emerging from fruits with boll weevil damage from egg-laying, when damaged fruit samples were held in the laboratory. Based on these results, we conclude that there is no impact of Bt cotton crop expressing Cry1Ac on the nontarget herbivores tested under field conditions.

Mutantes morfológicos de algodoeiro herbáceo como fonte de resistência ao bicudo

Este trabalho teve como objetivo avaliar os efeitos de três características morfológicas mutantes de linhagens de algodoeiro herbáceo (Gossypium hirsutum L. r. latifolium Hutch.), isoladas ou combinadas no mesmo genótipo, como fonte de resistência ao bicudo, Anthonomus grandis Boheman, 1843 (Coleoptera, Curculionidae). O experimento foi conduzido em campo, sob infestação natural, com delineamento de blocos ao acaso e arranjo fatorial 2<FONT FACE=Symbol>´</FONT>3 com um tratamento adicional, com quatro repetições. Em teste com chance de escolha, a característica bráctea frego foi a que apresentou maior redução no dano de oviposição pelo bicudo (34,71%), em relação ao equivalente normal. A folha "okra" reduziu o dano apenas quando associada à bráctea frego (40%). A combinação das três características mutantes na mesma planta proporcionou a menor porcentagem de botões com dano de oviposição (23,13%).

Economic Evaluation of Boll Weevil (Coleoptera: Curculionidae) Management Options for Early-Planted, Irrigated Cotton in the Texas Rolling Plains

A full-season, threshold-based insecticide control program, primarily for boll weevils, Anthonomus grandis grandis Boheman, was compared with no insecticide control in irrigated cotton in the northern Texas Rolling Plains from 1993 to 1995. These 2 insecticide-use options were compared in 3 cotton varieties (Paymaster HS-26, TAMCOT HQ95, All-Tex Quickie) and 2 row spacings (76 cm and 102 cm). Cotton was planted in late April–early May each year, which is an earlier planting time than the preferred period of late May–early June. Net returns per hectare were calculated for each treatment and used to determine the most cost-effective chemical and row spacing management option for each cultivar. Of the 29 insecticide applications for thrips, boll weevils, bollworms, Helicoverpa zea (Boddie), and cotton aphids, Aphis gossypii Glover, during the 3-yr study, 23 were for management of boll weevils. Boll weevil damage was lowest in HS-26 in the 76-cm spacing and in Quickie in the 102-cm spacing; these cultivars produced fewer squares and bolls in these 2-row spacings, respectively, than did the other 2 cultivars. Average yield and net income were higher in the 76-cm row spacing than in the 102-cm spacing, and yield and income were higher in HS-26 and HQ95 than in Quickie in both row spacings. Average yields were higher in treated plots, but average net income was higher in untreated cotton. In the 76-cm row spacing, highest net return was obtained from untreated Quickie ($161.10/ha), whereas in the 102-cm row spacing, highest net returns were obtained in treated HS-26 ($174.47/ha) and untreated HQ95 ($167.25/ha). In treated and untreated cotton, the break-even yields were 697 and 514 kg lint per hectare, respectively. In treated plots, yields for HS-26 in both 76- and 102-cm row spacings and for HQ95 in the 76-cm row spacing exceeded the break-even yield. Yields in all untreated plots, except Quickie in the 102-cm row spacing, exceeded the break-even yield. Based on comparisons of net returns between treated and untreated plots of each cultivar, only HS-26 in the 102-cm row spacing responded adequately to a full-season insect control program. In all other comparisons, net returns were numerically higher in untreated plots. Insecticidal control should be tailored to the cultivar and row spacing used.

Efficacy of Fipronil for Control of Boll Weevil, 1996

Abstract Cotton was planted 25 Apr in 40-inch rows (8-row X 75-ft plots) at the Texas Agriculture Experiment Station at Chillicothe. The experimental design was a RCB with 5 insecticide treatments and a check replicated 4 times. Cotton was inspected for boll weevil damage (percentage of boll weevil damaged squares per plot) and abundance of beneficial insects (25 sweeps/plot) on 3 Jul (pre-treatment), 11, 15, and 24 Jul (post-treatments). Insecticide treatments were applied on an approximate 5-day spray schedule on 5, 12, 17, and 22 Jul. The scheduled spray date of 10 Jul had to be postponed until 12 Jul because of a heavy rain on 7 Jul. Treatments were applied with a John Deere High Cycle 6000 sprayer. Spray drops were used to provide three nozzles per row, delivering 9.7 total gallons of spray solution per acre at 40 psi.

Control of Boll Weevil on Cotton with Selected Insecticides, 1997

Abstract A test was conducted at the Macon Ridge location of the Northeast Research Station to evaluate the efficacy of selected insecticides against boll weevil on cotton planted 22 Apr. Plots consisted of 4 rows (40-inch centers) X 50 ft. Treatments were arranged in a RCB design and replicated 4 times. Insecticides were applied on 28 and 30 Jun, 3, 8, and 11 Jul. Applications were made with a high-clearance sprayer calibrated to deliver 6 gpa through TX-8 hollow cone nozzles (2/row) at 47 psi. Treatments were evaluated by examining 50 cotton flower buds (squares) per plot 2-4 DAT for evidence of boll weevil damage. No additional foliar insecticides were applied to the plots during the test. The plots received 0.10, 2.08, and 0.08 inch rainfall on 28 Jun, 7 Jul, and 8 Jul, respectively. Data were analyzed with ANOVA, and means were separated according to DMRT.

Control of Boll Weevil in Cotton with Selected Insecticides, 1996

Abstract Three tests were conducted to evaluate the effi cacy of selected insecticides against boll weevil in cotton planted 18 Apr. Plots consisted of 4 rows (40 inch centers) X 50 ft. in all tests. Treatments were arranged in a RCB design with 4 replications. Insecticides were applied on 28 Jun, 1,3,8, and 12 Jul in all tests. Applications were made with a high clearance sprayer calibrated to deliver 6 gpa through TX-8 hollow cone nozzles (2/row) at 42 psi. Treatments were evaluated by examining 50 cotton flowei buds (squares) per plot 2-4 DAT for evidence of boll weevil damage. No additional foliar insecticides were applied to the plots during this test. The plots received 0.51 inch rainfall on 10 Jul. Data were analyzed with ANOVA, and means were separated according to DMRT.

Evaluation of Selected Insecticide Combinations for Control of Bollworm/Tobacco Budworm and Beet Armyworm, 1995

Abstract Plots were replicated 4 times in a RCB design and were 4 rows wide (40-in spacing) X 65ft. ‘Stoneville LA 887’ cotton seed was planted 19 May on a Commerce silt loam soil which was sidedressed with 90 lb N/acre. Cotton seed was planted with a John Deere model 7300 series planter equipped with standard seed hoppers. All plots received 0.5 lb (AI)/acre Temik 15G and 1.0 lb (AI)/acre Terraclor 2E + 0.05 lb (AI)/acre Ridomil 2E at planting. Foliar treatments were applied with a JD600 Hi-cycle equipped with a CO2 charged spray system through two TX-12 hollow cone tips per row and calibrated to deliver 10 gpa finished spray. Foliar treatments were applied on 29 Jul, 1, 8, 12, and 24 Aug. Twenty-five squares and 25 plant terminals from the 2 center rows were examined for eggs, bollworms, tobacco budworms, beet armyworms, and boll weevil damage on 3, 11, 16, and 30 Aug. Plots were harvested on 10 Oct. The center 2 rows of the plots were mechanically harvested using a John Deere spindle type picker. Yields are converted to lb seed cotton/acre.

Evaluation of Selected Insecticide Combinations Against Boll Worm/Tobacco Budworm in Louisiana, 1995

Abstract The efficacy of selected insecticides was evaluated against BW/TBW at the Macon Ridge location of the Northeast Research Station. Cotton seed was planted 12 Jun in plots consisting of 4 rows (40 inch centers) X 50 ft. Treatments were arranged in a RCB design and replicated 4 times. Applications were made with a high clearance sprayer calibrated to deliver 6 gpa through Teejet TX-8 hollow cone nozzles (2/row) at 46 psi. Insecticides were applied on 8, 11, 14, 18 Aug and 11 Sep. Treatments were evaluated by examining 50 flower buds (squares) per plot on 11, 14, 22 Aug for evidence of BW/TBW and boll weevil damage. Data reported for boll weevil represent a mean across all sample dates. The plots were mechanically harvested on 16 Oct to determine seed cotton yields. The test area was irrigated by an overhead sprinkler “as needed” during the season, but not within 48 h of treatment applications. Rainfall did not influence the effects of these treatments. Data were analyzed with ANOVA, and means were separated according to DMRT.

Observations On Dpl Nucotn 33 And Dpl Nucotn 35, 1995

Abstract Plots were 50 feet long and 16 rows wide (40-inch spacing) and consisted of a randomized complete block design with 3 replications. Transgenic cotton seed (NuCOTN 33 and NuCOTN 35) containing a gene from Bacillus thuringiensis kurstaki that codes for a delta endotoxin (BOLLGARD) toxic to certain lepidopteran larvae and seed of standard commercial varieties from Delta and Pine Land Seed Company (DPL 5415, DPL 20, DPL 5690 were planted 16May, on a Commerce silt loam soil which was sidedress fertilized with 90 lb N/acre. A John Deere model 7100 series planter equipped with 10 inch seed cones mountedto replace the seed hoppers was used for planting. The seed rate was 4 seeds/row ft. All plots received 0.5 lbs Al/acre Temik 15G and 1.2 lbs Al/acre Terraclor Super X at planting. Control measures for the heliothine complex were applied to the appropriate treatment on an “as needed” basis. Plant terminals and squares were examined for bollworm and tobacco budworm (BW/TBW) eggs, larvae, and damage and boll weevil damage on 3, 12, 17, 20, 24, 26 July, 1, 4, 7, 14, 21 Aug. Based on those observations, the plots designated as requiring treatments for the heliothine complex received the following control measures: Karate IE, 0.33 lb Al/acre + Larvin 3.2F, 0.25 lb Al/acre (18 Jul); Karate IE, 0.028 lb Al/acre + Larvin 3.2F, 0.25 lb Al/acre (2 Aug); Karate IE, 0.033 lb Al/acre + Lannate LV 2.4, 0.24 lb Al/acre (8 Aug); Baythroid 2E, 0.04 lb Al/acre + Curacron 8E, 1.0 lb Al/acre + Larvin 3.2F, 0.4 lb AI/ acre (17 Aug); Methyl parathion 4E, 0.33 lb Al/acre + Orthene 90S, 0.33 lb Al/acre + Confirm 2F, 0.125 lb Al/acre (25 Aug); and Methyl parathion 4E, 0.33 lb Al/acre + Evasion 1.5E, 0.25 lb Al/acre + Curacron 8E, 1.0 lb Al/acre (30 Aug). Control measures for nonheliothine pests applied as oversprays to all plots and/or the border rows on an “as needed” basis, consisted of the following treatments: Provado 1.6, 0.05 lb Al/acre (23 Jun); Bidrin 4E, 0.4 lb Al/acre + Evasion 1.5E, 0.2 lb Al/acre (29 Jun); Guthion 2L, 0.25 lb Al/acre (13 Jul); Baythroid 2E, 0.033 lb Al/acr + Larvin 3.2F, 0.25 lb Al/acre (18 Jul, applied to border rows only); Methyl parathion 4E, 0.33 lb Al/acre + Larvin 3.2F, 0.25 lb Al/acre (28 Jul); Methyl parathion 4E, 0.33 lb Al/acre + Larvin 3.2F, 0.25 lb Al/acre (2 Aug); Karate IE, 0.03 lb Al/acre + Methyl parathion 4E, 0.33 lb Al/acre + Lannate LV 2.4, 0.24 lb Al/acre (10 Aug); and Methyl parathion 4E, 0.33 lb Al/acre + Orthene 90S, 0.33 lb Al/acre + Confirm 2F, 0.125 lb Al/acre (25 Aug). Percent defoliation from insect feeding and number of damaged bolls per 3 meters was determined on 30 Aug. The center four rows of the plots were harvested on 12 Oct. Plots were harvested using a John Deere spindle type picker. Yields were converted to lbs. seedcotton/acre.

Control of Foliage Feeding Pests in Cotton, 1995

Abstract Plots were replicated 4 times in a RCB design and were 4 rows wide (40-in spacing) X 65ft. ‘Stoneville LA 887’ cotton seed was planted 19 May on a Commerce silt loam soil which was sidedressed with 90 lb N/acre. Cotton seed was planted with a John Deere model 7300 series planter equipped with standard seed hoppers. All plots received 0.5 lb (AI) Temik 15G and 1.0 lb (AI) Terraclor 2E + 0.05 lb (AI)/acre Ridomil 2E at planting. Foliar treatments were applied with a JD600 Hi-cycle equipped with a CO2 charged spray system through two TX-12 hollow cone tips per row and calibrated to deliver 10 gpa finished spray. Foliar treatments were applied on 2, 8, 12, and 25 Aug. Twenty-five squares and 25 plant terminals from the 2 center rows were examined for eggs, BW/TBW larvae and damage, BAW, and boll weevil damage on 3, 11, 16, and 29 Aug. Plots were harvested on 12 Oct. The center 2 rows of the plots were mechanically harvested using a John Deere spindle type picker. Yields are converted to lb seed cotton/acre.

Evaluation of Selected Insecticides for Control of Boll Weevil, 1995

Abstract Cotton was planted on 17 May at the James Ray farm in Lonoke County. Insecticides were applied on 11, 19, 22, 26, and 29 Aug with a John Deere 6000 hi-cycle equipped with a CO2 sprayer. Total volume was 7.2 gpa at 25 psi using Teejet TX-6 hollowcone nozzles on 19 inch spacing. Plots consisted of 12 rows (38 inch centers) X 50 ft. Treatments were arranged in a RCBD with 4 replications. Ratings were made 2-3 DAT by examining 25 squares/plot for boll weevil damage. The center 2 rows of each plot were harvested on 3 Nov using a John Deere 2-row picker.

Evaluation of Pirate 3SC Against Cotton Insect Pests in Louisiana, 1994

Abstract Cotton was planted 2 Jun with plots consisting of 4 rows (40 inch centers) × 50 ft. Treatments were arranged in a RCBD, replicated 4 times. Applications were made with a high clearance sprayer calibrated to deliver 6 gal total spray/acre through Teejet X-8 hollow cone nozzles (2/row) at 46 psi. Insecticides were applied on 9, 12, 15, 22 Aug and 1 Sep. Treatments were evaluated by examining 50 squares per plot on 12, 15, 19, 26 Aug for evidence of bollworm-tobacco budworm and boll weevil damage. The data reported for boll weevil are a summary of across sample dates. High numbers of soybean looper and beet armyworm larvae were observed in the plots during Sep and visual defoliation ratings were used to evaluate treatments on 21 Sep. Each plot was scored as follows: 0 (no feeding damage), 1 (feeding damage within the lower Vi of the plant), 2 (feeding damage in the lower Vs and middle % of the plant) or 3 (feeding damage throughout the plant). The plots were mechanically harvested on 25 Oct to determine seedcotton yields. The test area received 0.1, 1.9, 0.6 and 0.2 inches rainfall on 14, 21 Aug, and 2, 7 Sep, respectively. Supplemental moisture was provided by sprinkler irrigation “as needed” during the season, but not within 48 h of treatment applications.

Evaluation of Selected Insecticides for Control of Boll Weevil, 1994

Abstract Cotton was planted on 9 May at the James Ray farm in Lonoke County. Insecticides were applied on 2, 5, 12, 19, and 22 Aug with a John Deere 6000 hi-cycle equipped with a CO2 sprayer. Total volume was 10 gal/acre at 30 psi using Teejet TX-6 hollowcone nozzles on 19 inch spacing. Plots consisted of 12 rows (38 inch centers) × 50 ft. Treatments were arranged in a RCBD with 4 replications. Boll weevil ratings were made 2-3 DAT by examining 25 squares/plot for boll weevil damage. The center 2 rows of each plot were harvested on 10 Oct using a John Deere 2-row picker.

Control of Boll Weevil and Tarnished Plant Bug in Cotton with Selected Insecticides, 1994

Abstract Three tests were conducted to evaluate the efficacy of selected insecticides against boll weevil and tarnished plant bug in irrigated cotton planted 18 Apr. Plots consisted of 4 rows (40 inch centers) × 50 ft. in all tests. Treatments were arranged in a RCB design with 4 replications. Insecticides were applied on 1, 6, 11, 18, and 21 Jul in all tests. Applications were made with a high clearance sprayer calibrated to deliver 6 gal total spray/acre through TX-8 hollow cone nozzles (2/row) at 48 psi. Treatments were evaluated 4-5 times by examining 50 cotton squares (flower buds) per plot 3-5 DAT for evidence of boll weevil damage. Treatments were evaluated for tarnished plant bug control with a standard 15 inch diam sweep net by counting the number of adults and nymphs in a 25 sweep sample/plot on 25 Jul. No additional foliar insecticides were applied to the plots during this test. The test area received 0.46 inch rainfall on 4 Jul, 0.72 inch rainfall on 9 Jul, 1.6 inches rainfall on 14 Jul, 0.51 inch rainfall on 16 Jul, and 0.46 inch rainfall on 22 Jul. Data from each test were analyzed with ANOVA, and means were separated according to DMRT.

Evaluation of Selected Insecticides for Control of Boll Weevil, 1992

Abstract Cotton was planted on 6 May at the James Ray farm in Lonoke County. Insecticides were applied on 14, 18, 23, 28 Aug and 4 Sep using a John Deere 6000 hi-cycle equipped with a CO2 sprayer. Total volume was 10 gal/acre at 50 psi using Teejet TX-8 hollowcone nozzles on 19 inch spacing. Plots consisted of 10 rows (38 inch centers) × 50 ft. Treatments were arranged in a RCBD with 4 replications. Boll weevil ratings were made 4 DAT by examining 25 squares/plot for boll weevil damage. The center 2 rows of each plot were harvested on 6 Nov using a John Deere 2-row picker.

Evaluation of Selected Insecticides for Control of Boll Weevil, 1993

Abstract Cotton was planted on 15 May at the James Ray farm in Lonoke County. Insecticides were applied on 17, 20, 23, 27 Aug and 1 Sep using a John Deere 6000 hi-cycle equippped with a CO2 sprayer. Total volume was 10 gal/acre at 50 psi using Teejet TX-8 hollowcone nozzles on 19 inch spacing. Plots consisted of 10 rows (38 inch centers) x 50 ft. Treatments were arranged in a RCBD with 4 replications. Boll weevil ratings were made 2-4 DAT by examining 25 squares/plot for boll weevil damage.

Align, Raptor and Pirate Test for Boll Worm-Tobacco Budworm Control, 1994

Abstract The test was conducted at the Northeast Research Station near St. Joseph, LA. Plots were replicated 4 times in a RCBD and were 4 rows wide (40 inch spacing) × 65 ft. Stoneville LA 887 seed was planted 24 May on a Bruin silt loam soil with a John Deere model 7300 series planter equipped with standard seed hoppers. Temik 15G and Ridomil PC 11G were applied at 3.5 and 10 lb product/acre, respectively. Foliar treatments were applied with a compressed air powered sprayer multi-boom system attached to a John Deere 6000 Hi-Cycle equipped with two X-12 hollow cone nozzles/row and calibrated to deliver 10 gpa finished spray. Foliar treatments were applied on 25 Jul, 1, 15, and 19 Aug. Twenty-five squares from the 2 center rows of each plot were examined for boll weevil damage, bollworm-tobacco budworm damage and presence of bollworm-tobacco budworm larvae on 28 Jul, 4 and 25 Aug. All plant terminals in a 3 m section on one of the 2 center rows were examined for bollworm-tobacco budworm damage, eggs and larvae on 28 Jul. Plots were harvested on 5 Oct.

Damage and Costs Associated with Insect Management Options in Irrigated Cotton

This study measured the influence of planting date, cotton cultivar, and insecticidal control on pest abundance, damage, yield, and net returns in irrigated cotton. Cotton was planted in late April, late May, and late June from 1986 to 1989 at the Texas Agricultural Experiment Station at Monday. Densities of drips, Franklin fella occidentals (Pervade), were highest in cotton planted in late April and lowest in cotton planted in late June. Densities were not affected by the cultivates TOMCAT CANDIE or Lankart Sel 611. Lowest densities of cotton fleahoppers, Pseudatomoscelis seriatus (Reuter), were recorded in cotton planted in late April and highest in cotton planted in late June. Cotton fleahopper densities were significantly higher in ‘CAMD-E’, as compared with ‘Lankart Sel. 611’, in the late June planting; but differences were not observed between cultivars in the other two planting dates. Densities of overwintered boll weevils, Anthonomus grandis grandis Boheman, were highest in cotton planted in late April. When averaged over the four years, densities of bollworm, Helicoverpa zea (Boddis), larvae were not influenced significantly by planting date or by cultivar. Boll weevil damage during the growing season was almost twice as high in the late-June planting compared with damage in the late-April and late-May plantings. Percentage square damage was reduced in both cultivars treated with insecticides compared with damage in untreated plots when cotton was planted in late April; there were no differences between treated and untreated plots in either cultivar when cotton was planted in late May. When cotton was planted in late June, percentage square damage was reduced in ‘CAMD-E’ plots treated with insecticides compared with damage in untreated plots, but differences were not observed between treated and untreated plots in ‘Lankart Sel. 611’. Ninety-four percent of the insecticide applications were for management of boll weevils. Lint yields were similar in the late-April and late-May planting dates; both dates produced higher yields than those in the late June planting. Yields were higher in ‘CAMD-E’ than in ‘Lankart Sel. 611’, and yields in treated plots were higher than those in untreated plots. Net returns were lowest in late June cotton, but they were similar in the late-April and late-May plantings. Net returns for ‘CAMD-E’ were higher than those for ‘Lankart Sel. 611’. Returns were higher in untreated cotton compared with treated cotton in the late-April and late-June planting dates. Differences were not observed between returns in treated and untreated plots in the late-May planting date.